The first heart sound or "lub" results from closure of the tricuspid and mitral valves. It is a rather low-pitched and a relatively long sound which, as indicated in, represents the beginning of ventricular systole. The second heart sound, or "dub," marks the beginning of ventricular diastole. It is produced by closure of the aortic and pulmonary (pulmonic) semilunar vanes when the intraventricular pressure begins to fall
They are the heart sounds S1 and S2. S1 or "lub" is the snapping shut of the tricuspid and mitral valves as the ventricles begin to contract. S2 or "dub" follows and is the closure of the aortic and pulmonary valves as the ventricular pressures drop below the aortic or pulmonary pressure.
you could make a family tree to represent your family(:
What two features must a sample have to accurately represent a population?
When a sound reaches one ear, the additional time it takes for the sound to reach the other ear helps the brain estimate the origin of the sound.
A punnet square uses letters to represent dominant and recessive alleles.
sound is actually vibrations. your eardrum is highly sensitive, like ripples on water, it picks up these vibrations
In the lub-dub version of heart sound, dub is caused by the back rush of blood against a closed aortic or pulmonary valve.
Volume
In the word "center," the letter C represents the sound /s/.
Dipthong
It makes the sound to represent leaves rustling!
Amplitude: 'loudness'Frequency: 'pitch'
That's a "diphthong".
The Germanic character of runic origin used to represent the sound "th" is called thorn. It resembles the letter "p" with an extra vertical line extending from the top. Thorn was commonly used in Old English and Old Norse texts.
notes?
Pitch is often used to represent the frequency of a sound in music. It is distinguished from frequency though, because pitch involves how a human perceives that sound.
a letter, also called a grapheme.
Y and Z are the last letters in the alphabet. W and J were the last letters to be added to the alphabet. Originally, the letter U was also used to represent the W sound, and the letter I to represent the J sound.